Microwave filter with reduced penetration of tuning screws
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United States of America Patent
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N/A
Issued Date -
May 22, 2003
app pub date -
Nov 16, 2001
filing date -
Nov 16, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Apparatus and method for filtering an electromagnetic signal employs the feeding of the signal via a rectangular waveguide to a plural mode cavity filter with coupling available at plural modes. The cavity has a mode-coupling structure such as a mode-coupling screw. The waveguide operates at a first mode of lower cutoff frequency and a second mode of higher cutoff frequency. The feeding is at a frequency for propagation in the first mode. The cavity radiates back into the waveguide, or into another waveguide, below the higher cutoff frequency to provide an evanescent reactive loading which reduces the required penetration of tuning screws for reduced dissipation of power in the tuning screws.
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